Weighing scale



Jan. 31, 1933. s. VERNET ET AL WEIGHING SCALE Filed July 24, 1931- 2 Sheets-Sheet 1 INVENTORS Sergyms Vm 1 Ar 627125.! 7:65

4 BY X (0% I A RN EY Jan. 31, 1933. Y NET T L 1,895,502

WE'I'GHING SCALE Filed July 24, 1:931 2 Sheets-Sheet 2 t INVENTORS J'er z'us Ve n Patented 10.11.31, 1933 PATENT omca snimms 11mm,- or nooxmm,

AND ARTmS J. HAYNES, FOREST HILLS, NEW YORK WEIGHING. SCALE Application filed July 84, 1931. Serial No. 552,878.

This invention relates to weighing apparatus and the objects of the invention are to provide a simple, practical, durable and inexpensive device of this type, in compact form and adapted to be easily read.

These various objects are attained by the novel features of construction, combinations and relations of parts hereinafter described, illustrated and broadly claimed.

The drawings accompanying and forming part of the s ecification illustrate one commercial embo iment of the invention, it being understood that the structure may be modified as regards this particular disclosure, 13 without departure from the true spirit and broad scope of the invention.

Fig. 1 is a horizontal sectional view of the scale as taken on substantially the plane of line 1-1 of Fig. 2, with the active parts of the 29 scale appearing in plan and the rim and other integral portions of the scale platform appearing in section; Figs. 2, 3 and 4 are crosssectional views, substantially on lines 22 33 and 44 of Fig. 1, showing details of 23 the leverage system and the ressure actuated indicator mechanism carried thereby.

The base of the scale is illustrated as a generally rectangular skeleton frame 7, having an upstanding flange 8 and provided ad- 30 jacent one edge, the left hand edge in the several views, with the internal supports or fulcrum posts 9 and adjacent the opposite edge with the upstanding inwardly arched supports 10.

The scale platform 11 is shown as similarly shaped and as having a dependent flange 12, coming down over the upstandin flange of the base. This top member has adjacent one edge, the dependent fulcrum posts 13, in line 0 with fulcrum posts 9 of the base and adjacent the opposite edge, the dependent inwardly arched posts 14, in line with posts of the base.

The suspension system consists in the illus- 45 tration of crossed leverspivotally connected in scissors relation and connected at opposite ends with the base and platform res ectively. These scale levers are branche at their opposite ends for connection at the four fulcrum points. Thus one lever 15 has branches 16, suspended by links 17, from the base supports 10 and oppositely extendmg branches 18, terminating in knife edges 19, engaging the bearings 20, in the fulcrum posts of the platform. The branched por- 65 tions of this lever are connected by a cross bar 21, carrying open bearings 22 for the center pivot of the two levers.

The second scale lever is desi nated 23 and this like the other, is branched or connection with the four fulcrums. Thus two of the branches 24 have knife edges 25, seating in bearings 26 on the posts 9 of the base and the opposite end branches 27 of this lever are connected by links 28, with the inwardly arched dependent posts 14 of the scale top. At the center line, the sides of the second lever carry knife edges 29, seating in the bearings 22, carried by the cross bar of the first lever.

The branches or sides of the second 'lever are connected near one end by cross bar 30 and adjacent the opposite end by'a cross piece 31, opposed to a cross piece 32 connecting the branches or sides of the first lever. The two levers thus are in the nature of open parallel sided frames and as may be noted in Fig. 1, the side portions of the second frame 23 are spaced a less distance apart than the sides of the first lever, so that said second lever may pass from a position above the second lever down between the cross bars 21, 32, into position beneath the first lever. This crossed arrangement of the levers provides the desired so-called scissors relation, with the levers pivoted together at the center and each con- 35 nected at opposite ends with the base and top respectively. With such construction, also it will be noted, all suspension points may be located in the same horizontal lane, with the links at the right hand ends 0 the levers, al- 99 lowing for the necessary slight arcuate motion of the lever ends.

The weight indication is provided in the present invention by a pressure developing device interposed between the crossed levers and connected with a suitable pressure sensitive indicatin device. In the illustration, the pressure eveloping mechanism consists simply of a liquid holding chamber 33, formed as a cavity in cross bar 31 of the secthe pressure chamberby a short loop of pip-' e pressure gage may be of the Bourdonv tube type as indicated in Fig. 1 audit may be supported beneath the latform in position to be read through a win ow 38 therein.

The pressure device, forming as it does part of and being carried by opposing portions of the scale levers, requires no additional mounting and the gage may be supported by the piping 37, so as to require no special mounting. The relative movements of the scale levers and of the platform in respect thereto, are relatively slight, so that only small clearance need be provided between such parts and the. age, such as indicated in Fig. 4, the gage oating with the levers, supported from the pressure chamber of the lower lever free of contact with both the up-, per lever and the latform. I

The location 0 the pressure developing mechanism between thelevers and atone side of their pivotal connection, provides a very compact construction and avoids the necessity of providing any special mounting means for such mechanism on the base or platform of the scale. Greater accuracy is obtained because of the directness of applied force without interposing frictional or other variations. The parts are readily assembled, it being observed'that the upper piston member of the pressure device merely rests on the diaphragm closing the top of the pressure chamber. Preferably, as indicated, the piston member covers the maximum portion of the area of the diaphragm, which latter may be protected against rupture by a flange 39, overstanding the diaphragm, except for the small clearance 40, about the sides of the piston element.

' The various parts of the scale are relatively sturdy and ma be roduced inexpensively.

Also the assem 1y 0 the structure is readily accomplished, without requirlng special skill or care. The base and platform cooperate'to form an enclosure about the moving parts of the apparatus. The vertical enclosing flange of the base is shown as slotted at 41, for the dependent fulcrum lugs on the top, but these slots need not be so extensive as to impair the enclosing characteristics of the structure. The diaphragm 34 may be of rubber or other sufliciently resilient or flexible material and to save and protect the same from wear, etc. as much as possible, it may be covered with a thin layer 42 of flexible material such as leather or the like confined by the securing flange,39 and bridging the gap 40 between the plunger and flange.

The embodiment illustrated may be considered as typifying a referred form of the invention, but it will ap arent' that details and-structure may be c anged to meet different conditions or requirements, all within the broad scope of the claims. The language employed also is to be considered in a descriptive, rather than in a limiting sense, except possibly for such limitations as may be imposed by the state of the prior art.

What is claimed is: y

1. weighing scale comprising in combinatlon with crossed scale levers and a scale platform acting thereon, a fluid pressure device having companion elements interposed between and carried by said crossed scale levers and a suitably calibrated ressure gage operatively connected with sai pressure device.

2. A weighing scale comprising in combination with crossed scale levers and a scale platform acting thereon, a fluid pressure device having companion elements interposed between and carried by said crossed scale levers, a sultably calibrated ressure gage operatively connected with sai pressure device, said ressure device comprising a pressure cham er carried by one scale lever and provided with a flexible wall and a piston element connected with the other scale lever and bearing on said flexible wall.

3. A weighing scale comprising a' base and a platform, scale levers interposed between said base and platform, companion members of a fluid pressure device carried by said scale levers and pressure actuated indicating means operatively connected with said fluid pressure device.

4. In combination, a scale platform having a window therein, platform suspending means beneath the latter, a fluid' pressure device actuated by said suspendin means beneath the platform and a suita 1y calibrated pressure gage connected with said pressure device and supported beneath the platform in position for viewing through said platform window.

5. In combination, a scale platform having a window therein, platform suspending means beneath the latter, a fluid pressure device actuated by said suspending means he neath the platform and a suitably calibrated.

pressure gage connected with said pressure device, said gage being supported independently of the platform by a rigid conduit connection from the pressure device.

6. A weighing scale comprising a base and an overstanding platform, crossed scale levers having an intermediate pivotal connection and pivotally connected at their opposite ends with the base and platform re spectively, a flexible walled pressure chamber carried by one of the levers, a pressure applying member carried by the other lever and acting on the flexible walled pressure chamber and a pressure responsive 130 weight indicator connected with the pressure chamber.

7. A weighing scale comprising a base and an overstanding platform, crossed scale levers having an intermediate pivotal connection and pivotally connected at their opposite ends withthe base and platform respectively, a flexible walled pressure chamber carried by one of the levers, a pressure applying member carried by the other lever and acting on the flexible walled pressure chamber, a pressure responsive weight indicator connected with the pressure chamber, said indicator being supported beneath the platform and said platform having a window exposing said indicator.

8. A weighing scale comprising a base and an overstanding platform, crossed scale levers having an intermediate pivotal connection and pivotally connected at their opposite ends with the base and platform respectively, a flexible walled pressure chamber carried by one of the levers, a pressure applying member carried by the other lever and acting on the flexible walled pressure chamber, a pressure responsive weight indicater connected with the pressure chamber, the scale levers being arranged in crossed relation with a rocking pivotal connection at the center and rocking pivotal connections at one side of the center with the base and platform respectively, said levers at the opposite side of the center having swinging link connections with the base and platform.

9. A wei hing .scale comprising a base and an overstanding platform, crossed scale levers having an intermediate pivotal connection and pivotally connected at their opposite ends with the base and platform respectively, a flexible walled pressure chamber carried by one of the levers, a pressure applyng member carried by the other lever and acting on the flexible walled pressure chamber, a pressure responsive weight indicator connected with the pressure chamber, the scale levers being arranged in crossed relation with a rocking pivotal connection at the center, rocking pivotal connections at one side of the center with the base and platform respectively, said levers at the opposite side of the center having swinging link connections with the base and platform and the members of the pressure device being positioned between crossing portions of the levers between the rocking center pivot and the rocking side pivots.

10. A weighing scale comprising a base and a platform, a lever having knife edge bearings on said base at one end and swinging link connections with the platform at the opposite end, a second lever having knife edge connections with the platform at the same side of the scale with the knife edge bearings of the first lever and having swinging link conand nections with the base at the same side of the scale with the swinging link connections of the first lever, said two levers having an intermediate knife edge bearing and a pressure device interposed between and supported by the two levers.

11. A weighing scale comprising a base and a platform, a lever having rocking bearing]: on said base at one end and swinging lin connections with the platform at the 0p posite end, a second lever having rocking earings with the platform at the same side of the scale with the rocking bearings of the first lever and having swinging link connections with the base at the same side of the scale with the swinging link connections of the first lever, said two levers having an intermediate rocking bearing and a pressure device interposed between and supported by the two levers.

12. A weighing scale comprising a base and a platform, a lever having rocking bear lngs on said base at one end and swinging link connections with the platform at the opposite end, a second lever having rocking bearings with the platform at the same side of the scale with the rocking bearings of the first lever having swinging link connections with the base at the same side of the scale with the swinging link connections of the first lever, said two levers having an intermediate rockmg bearing, a pressure device interposed between and supported by the two levers and a pressure responsive indicator supported at a distance from the pressure device and connected therewith by a fluid conduit.

13. A weighing scale comprising base and platform members, skeleton levers having spaced side portions connected by cross bars and said side portions being connected at opposite ends with the base and platform respectively, the side portions of one of said s :eleton levers crossing and having a pivotal. engagement with a cross bar portion of the other lever and companion members of a pressure device supported in opposition by other cross bar members of the skeleton levers.

14. A weighing scale comprising base and platform members, skeleton levers having spaced side portions connected by cross bars and said side portions being connected at opposite ends with the base and plat-form respectively, the side portions of one of said skeleton levers crosing and having a pivotal engagement with a cross bar portion of the other lever, companion members of a pressure device supported in opposition by other cross bar members of the skeleton levers, a preure conduit extending from one member of said pressure device and a pressure responsive indicator connected with said conduit.

15. A weighing scale comprising a base having'an-u tanding flange and provided eating means operatively cofinect'e'd'with said within said 'ange with vupstanding fulcrum floating fluid pressure device;

posts at one side and upstanding inwardly In testimony whereof we aflix oum-signaarched posts at the opposite side, a platform tures.

overstanding the base and having de endent fulcrum posts at one side and depen ent inwardly arched posts at the opposite side, levers having crossed intermediate portions in bearing engagement, one of said leversbeing fulcrumed on upstanding posts of the base at one end and swivelly connected with dependent posts of the platform at the opposite end, the other lever beingfulcrumed on dependent posts of the platform at one end and swivelly hung from u standing posts of the base at the opposite en a pressure chamber on one of the levers, said pressure chamber having a flexible \gall, a piston element carried b the other "l ver and bearing on said flexi le wall and a pressure responsive indicator operatively connected with said pressure chamber.

16. In a weighing scale, the combination of crossed scale levers, a pressure chamber carried by one of said levers, a flexible diaphragm closing said pressure chamber, a confining flange overstanding said flexible diaphragm but leavin a portion of the same exposed, a piston mem ber approximating the shape of the opening in sa1d flange but operating freely therethrough, said piston member being actuated by the other lever and a pressure responsive weight indicator operatively connected with the pressure chamber.

17. In a weighing scale, the combination of crossed scale levers, a pressure chamber carried by one of said levers, a flexible diaphragm closing said pressure chamber, a confining flange overstanding said flexible diaphragm but leaving a portion of the same exposed, a piston member approximating the shape of the opening in sa1d flange but operating freely therethrough, said piston member being actuated by the other lever,

a pressure responsive weight indicator operatively connected with the pressure chamber and a flexible reinforcement over the diaphragm and bridgingthe space between the piston member and the confining flange;

18. In a weighing scale, the combination of a scale platform, scale levers supporting the same, a rigidfluid cavity formed in one lever, a flexible diaphragm closing said cavity, a retaining flange over said diaphragm and extending inwardly beyond the inner walls of the cavity and a plunger actuated by the other scale lever and bearing on said diaphragm adjacent the inner edge of the retaining flange.

19. A weighing scale comprising abase and a platform scale levers interposed between said base and platform, a fluid pressure device floatingly carried by said scale levers independently of the base and indi- .SERGIUS VERNET, ARTEMAS .LHAYNES. 

